I USED TO think that slacklining was the hippie version of tight-rope walking, but since my college days it has turned into one of the biggest adrenaline-pumping experiences out there. People have slacklined across the Grand Canyon, between skyscrapers, and now, they are pushing the limit with nothing between them but two hot air balloons.

“Don’t try this at home” doesn’t even come close to a disclaimer.

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